Flash Thermophysical Measurement Using Periodic Pulsed Heating
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Solution Overview
Problem
The flash method for measuring thermophysical properties faces challenges in securing a sufficient signal-to-noise ratio (S/N) and preventing thermal damage or property alteration of the measurement target due to unintended temperature rise.
Innovation Solution
A thermophysical property value measurement device and method that uses periodic pulsed light irradiation, temperature measurement, and computational analysis to enhance S/N ratio and correct temperature data, calculating thermophysical properties based on periodic temperature spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light intensity of the pulsed light is increased to acquire the S/N ratio of the measurement signal, then the S/N ratio is improved, but the measurement target member may be thermally damaged or the thermophysical property may change
Solution Approach 1:
The patent applies periodic pulsed light irradiation instead of single pulsed light irradiation. By irradiating the measurement target member with pulsed light that periodically flashes multiple times, the temperature rise is distributed over multiple cycles, preventing excessive temperature increase while accumulating sufficient measurement signal to improve the S/N ratio.
2Ease of operation
If a single pulsed light is used for irradiation, then the measurement process is simple, but the S/N ratio of the measured signal cannot be sufficiently secured
Solution Approach 1:
The patent uses periodic pulsed light irradiation where the light is applied multiple times in succession. This continuous action accumulates the thermal effect and measurement signal over multiple cycles, maintaining measurement simplicity while significantly improving the S/N ratio compared to single pulsed light irradiation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves measurement accuracy by enhancing the S/N ratio and preventing thermal damage, while accurately determining thermophysical properties.
Implementation Method 1
irradiation with a single pulsed light increases the temperature of a measurement target member
Implementation Method 2
a temperature measuring unit that measures a temperature of the measurement target member
Data Source
AI summary
A thermophysical property value measurement device and thermophysical property value measurement method, which can enhance measurement accuracy of a thermophysical property value by increasing the S/N ratio of a measurement signal, while preventing a measurement target member from being damaged and a thermophysical property from varying due to unintended temperature rise, in measurement of the thermophysical property value by a flash method. A thermophysical property value measurement device according to the present disclosure includes: a light emitting unit that irradiates a measurement target member S with a pulsed light that periodically flashes; and a computation unit that computes periodic temperature data from a temperature measuring unit. The computation unit generates a periodic temperature spectrum from the periodic temperature data, retrieves a periodic pulse temperature spectrum analytical solution acquired from a theoretical formula of temperature change by a single pulsed light, calculates respective parameters of the periodic pulse temperature spectrum analytical solution, supposing that the periodic pulse temperature spectrum analytical solution matches the periodic temperature spectrum, and calculates a thermophysical property value of the measurement target member S, based on the calculated respective parameters.